Water Supply Systems - Impurity Limits
Typical limits for impurities in water supply systems:
| Impurity | Limit (ppm) |
|---|---|
| Color | 20 |
| Copper | 3.0 |
| Fluoride | 1.0 |
| Hardness, Ca and Mg salts | 100 |
| Lead | 0.1 |
| Magnesium | 125 |
| Iron plus manganese | 0.3 |
| Solids | 500 |
| Turbidity | 10 |
Turbidity is is an optical characteristic and a the measure of the relative clarity of a liquid. It is a measurement of the amount of light that is scattered by material in the water when a light is shined through it. High intensity of scattered light equals to high turbidity.
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